外压和力偶荷载组合作用下含凹陷缺陷海底管道的局部屈曲和极限弯矩承载力  

Local buckling and ultimate moment capacity of subsea pipelines with dent defects under combined loads including external pressure and couple

作　　者：陈严飞[1,2] 侯富恒 黄俊 董绍华 贺国晏[1] 刘宇 王春莎[1] CHEN Yanfei;HOU Fuheng;HUANG Jun;DONG Shaohua;HE Guoyan;LIU Yu;WANG Chunsha(National Engineering Laboratory for Pipeline Safety in China University of Petroleum(Beijing), Beijing 102249, China;State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116024, China;CNOOC Research Institute, Beijing 100102, China)

机构地区：[1]中国石油大学(北京)油气管道输送安全国家工程实验室,北京102249 [2]大连理工大学工业装备结构分析国家重点实验室,辽宁大连116024 [3]中海油研究总院,北京100102

出　　处：《中国石油大学学报（自然科学版）》2022年第3期166-173,共8页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家自然科学基金项目(51779265,52171285);大连理工大学工业装备结构分析国家重点实验室开放基金项目(GZ19119);中国石油大学(北京)科研基金项目(2462020YXZZ045)。

摘　　要：凹陷缺陷是海底管道常见的缺陷形式,同时海底坍塌、泥石流、沙坡沙脊活动以及海底高静水压,会使管道受到外压和外部力偶荷载的组合作用,威胁管道的安全运行,如何对复杂海底环境下凹陷管道进行准确的完整性评价是热点问题之一。采用数值模拟方法研究外压和力偶组合载荷作用下含凹陷海底管道局部屈曲失效机制和极限弯矩承载力,并对影响管道极限弯矩承载力的参数进行敏感性分析。结果表明凹陷深度、径厚比与外压均对海底管道的极限弯矩承载力有显著影响;在径厚比相同时,凹陷深度与外压越大,极限弯矩承载力越小;且管道的失效模式与加载外压有关,对凹陷管道进行完整性评价时需考虑外压影响。Dent is a common type of defects for subsea pipelines.Subsea pipelines are always under the combined loads of the external pressure and couple,which are usually caused by the benthos collapse,the debris flow,the activity of sand ridge and the high hydrostatic pressure.These factors would threaten the safety work of the pipelines.It is one of the hot topics to accurately evaluate the integrity of subsea pipelines with dent defects under the complex subsea conditions.The numerical simulation method was used to investigate the local buckling failure and ultimate moment capacity of subsea pipelines with dent defects under the combined action of the external pressure and couple,and the sensitivity analysis was also carried out.The results show that the dent depth,the diameter-thickness ratio and the external pressure have significant effects on the ultimate moment capacity of subsea pipelines.When the diameter-thickness ratio is fixed,the ultimate moment capacity decreases with the increase of the dent depth and the external pressure.Moreover,the failure mode of pipelines is related to the external pressure.Therefore,when evaluating the integrity of subsea pipelines with dent defects,it is necessary to focus on the effect of external pressure.

关 键 词：海底管道 凹陷 局部屈曲 极限弯矩承载力 完整性评价 

分 类 号：TE973[石油与天然气工程—石油机械设备]